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		<title>百分比 top - ie6,7,firefox表现不同</title>
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		<p>我服了 百分比 top - ie6,7,firefox表现不同</p>
		<div style="border:1px solid black;padding:1px;width:300px;overflow:hidden;height:100px;">
			<div>
		<div style="width:200px;height:50px;position:relative;top:50%;border:1px solid red;color:red;padding:1px;">relative : top : 50%</div>
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